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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Park, Hongrae Michael, M. Bernitsas Kim, Eun Soo |
| Copyright Year | 2013 |
| Abstract | In the Marine Renewable Energy Laboratory of the University of Michigan, selectively located surface roughness has been designed successfully to suppress vortex-induced vibrations of a single cylinder by 60% compared to a smooth cylinder. In this paper, suppression of flow-induced motions of two cylinders in tandem using surface roughness is studied experimentally by varying flow velocity and cylinder center-to-center spacing. The two identical cylinders are rigid, suspended by springs, and allowed to move transversely to the flow direction and their own axis. Surface roughness is applied in the form of four roughness strips helically placed around the cylinder. Results are compared to smooth cylinders also tested in this work. Amplitude ratio A/D, frequency ratio fosc/fn,water, and range of synchronization are measured. Regardless of the center-to-center cylinder distance, the amplitude response of the upstream smooth-cylinder is similar to that of the isolated smooth-cylinder. The wake from the upstream cylinder with roughness is narrower and longer and has significant influence on the amplitude of the downstream cylinder. The latter is reduced in the initial and upper branches while its range of VIV-synchronization is extended. In addition the amplitude of the upstream rough cylinder and its range of synchronization increase with respect to the isolated rough cylinder. |
| Sponsorship | Ocean, Offshore and Arctic Engineering Division |
| File Format | |
| ISBN | 9780791855416 |
| DOI | 10.1115/OMAE2013-10125 |
| Volume Number | Volume 7: CFD and VIV |
| Conference Proceedings | ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering |
| Language | English |
| Publisher Date | 2013-06-09 |
| Publisher Place | Nantes, France |
| Access Restriction | Subscribed |
| Subject Keyword | Water Strips Renewable energy Wakes Surface roughness Synchronization Flow (dynamics) Springs Circular cylinders Cylinders Vortex-induced vibration |
| Content Type | Text |
| Resource Type | Article |
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